/* Copyright (c) 2021, LiWangQian<liwangqian@huawei.com> All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "cpplua/tool/symbol/local_scope.h"
#include <unordered_map>

CPPLUA_NS_BEGIN
namespace tool::__detail {

struct scope_data {
    ~scope_data() = default;
    scope_data() = default;

    inline void define(const string_t &name, symbol *s);
    inline symbol *resolve(const string_t &name);

private:
    std::unordered_map<string_t, symbol*> symbols_;
};

inline void scope_data::define(const string_t &name, symbol *s)
{
    symbols_[name] = s;
}

inline symbol *scope_data::resolve(const string_t &name)
{
    auto iter = symbols_.find(name);
    if (iter != std::end(symbols_)) {
        return iter->second;
    }
    return nullptr;
}

local_scope::~local_scope()
{
    delete data_;
}

local_scope::local_scope(scope *parent, uint32_t depth)
    : scope{parent, depth}
{
    data_ = new scope_data;
}

bool local_scope::define(const string_t &name, symbol *s)
{
    data_->define(name, s);
    return true;
}

symbol *local_scope::resolve(const string_t &name)
{
    auto s = data_->resolve(name);
    if (s != nullptr) {
        return s;
    }

    if (parent_ != nullptr) {
        return parent_->resolve(name);
    }

    return nullptr;
}


} // namespace tool::__detail
CPPLUA_NS_END
